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Low Metallicities and Old Ages for Three Ultra-Diffuse Galaxies in the Coma Cluster
Meng Gu, Charlie Conroy, David Law +17
A large population of ultra-diffuse galaxies (UDGs) was recently discovered in the Coma cluster. Here we present optical spectra of three such UDGs, DF7, DF44 and DF17, which have…
Extensive Globular Cluster Systems Associated with Ultra Diffuse Galaxies in the Coma Cluster
Pieter van Dokkum, Roberto Abraham, Aaron J. Romanowsky +7
We present Hubble Space Telescope imaging of two ultra diffuse galaxies (UDGs) with measured stellar velocity dispersions in the Coma cluster. The galaxies, Dragonfly 44 and DFX1,…
The Dragonfly Nearby Galaxies Survey. III. The Luminosity Function of the M101 Group
Shany Danieli, Pieter van Dokkum, Allison Merritt +4
We obtained follow-up HST observations of the seven low surface brightness galaxies discovered with the Dragonfly Telephoto Array in the field of the massive spiral galaxy M101. Ou…